var let const in Javascript Scope | Understanding Global Local Function Block Scope
Web Dev Roadmap for Beginners (Free!): https://bit.ly/DaveGrayWebDevRoadmap
In this video we'll compare the keywords var, let, and const in JavaScript which also requires an understanding of JavaScript scopes such as global scope, local scope, function scope, and block scope.
▶ This video is part of the JavaScript Tutorials for Beginners Playlist found here: • Javascript Tutorials for Beginners
✅ Quick Concepts outline:
var, let, and const in Javascript
(00:00) Intro
(0:30) What makes var different
(1:40) What makes let different
(2:05) What makes const different
(2:35) A discussion of scope
(2:50) Global Scope
(3:25) Local Scope
(3:35) Block Scope
(4:00) Function Scope
(4:45) Local Scope variables declared with let or const are not available in global scope
(6:00) Nested block scope inside of a function
(7:05) Global scope variables are available in local scopes
(8:00) Global scope is available to all scopes
(8:25) If statements have block scopes
(8:35) for loops have block scopes
(8:45) switch statements have block scopes
(9:00) Review of scopes so far...
(9:50) A 2nd Example of global, function, and block scopes
(14:40) Note: var is function scoped; const & let are block scoped
(15:45) Review with helpful graphic :)
📚 Further Reading:
MDN Web Docs:
Scope: https://developer.mozilla.org/en-US/d...
Global Scope: https://developer.mozilla.org/en-US/d...
Local Scope: https://developer.mozilla.org/en-US/d...
Eloquent JavaScript Chapter 3:
https://eloquentjavascript.net/03_fun...
📺 More Beginner JS Videos:
freeCodeCamp: • Learn JavaScript - Full Course for Be...
Traversy Media: • JavaScript Crash Course For Beginners
The Net Ninja: • Modern JavaScript Tutorial #1 - Intro...
✅ Follow Me:
Twitter: / yesdavidgray
Reddit: / daveoneleven
Medium: / davegray_86804
#var #let #const
En esta página del sitio puede ver el video en línea var let const in Javascript Scope | Understanding Global Local Function Block Scope de Duración hora minuto segunda en buena calidad , que subió el usuario Dave Gray 08 septiembre 2020, comparta el enlace con amigos y conocidos, en youtube este video ya ha sido visto 17,164 veces y le gustó 653 a los espectadores. Disfruta viendo!
